My children will be educated to follow their own choices -- I will merely supply them with the wherewithal to make their own choices in life. If that's an understanding of their Jewish culture which leads them to continue those traditions, then its all good. If it's a distrust of organised religion and a rejection of religious Judaism, then so be it. And if it's an appreciation of their mixed background in equal parts (at the cost of losing their Jewishness), that's fine too. As long as the result is a balanced, happy and confident individual, I don't much care if they choose to be Frum or behave like a Goy/Shiksa.
I have fully immersed myself in my wife's culture -- I can says the Baruchs on a Friday night, we celebrate the big festivals (and let me tell you, Jewish festivals are GREAT for kids -- so inclusive and educational, like Passach), I go to all the family occasions (Bar/Bat Mitzvahs, Shivas, etc.) and do not feel out of place whatsoever... despite all of this understanding and involvement with the Jewish culture, I still cannot get my head around the pressure that parents place on their children not to marry out.
It is a truly alien concept to me, and I cannot help feel anger at times. My brother in law tears himself up over the fact he has a secret Shiksa girlfriend, and I remember the prejudice I received and being made to feel like an outcast... in my book, that is a big flaw in the culture.
You see, I'm about as mixed a mongrel as you get, and therefore my Jewish children are too: Russian, Polish, English, Irish, Scottish, and Chinese genes. I am the product of a (racially) mixed marriage. My children are the products of a religiously mixed marriage. And you know what? We're all leading happy healthy lives.
My in-laws accepted me years ago. I forgave them for what they put us through. But I cannot condone what they did. Attitudes like that can make their children's lives a misery and cause terrible anguish and damage. Was it necessary? Really? look at the result -- their daughter married out to someone she loves and makes her happy, and they have some more wonderful grandchildren who they love dearly. And now my background is no longer an issue for them.